/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.huaweicloud.config.client.kie;

import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import org.springframework.util.StringUtils;

public abstract class ConfigValueProcessor<T> {

  abstract Map<String, Object> process(T source);

  protected Map<String, Object> toMap(String prefix, Properties properties) {
    if (properties == null) {
      return Collections.emptyMap();
    }
    Map<String, Object> result = new HashMap<>();
    Enumeration<String> keys = (Enumeration<String>) properties.propertyNames();
    while (keys.hasMoreElements()) {
      String key = keys.nextElement();
      Object value = properties.getProperty(key);
      if (!StringUtils.isEmpty(prefix)) {
        key = prefix + "." + key;
      }
      if (value != null) {
        result.put(key, value);
      } else {
        result.put(key, null);
      }
    }
    return result;
  }
}
